One of the most important quantities of QGP is the energy loss of a quark moving through the plasma. An external quark was introduced in the context of AdS/CFT correspondence by adding a fundamental string attached to a flavor brane in the AdS space [1]}, [2]}, [3]}. The string endpoint specifies the heavy quark, while the string itself can be considered as a gluonic cloud around the quark. It is straightforward to show that the mass of quark is proportional to the inverse distance of the string endpoint from the boundary [1]}. The light quark or massless quark is mapped into a string attached to a flavor brane which is extended from the boundary to the horizon, and its dynamic in different holographic backgrounds have been studied in [5]}, [6]}, [7]}, [8]}. On the other hand, a string attached to the boundary of AdS space is dual to an infinite mass quark. Since the first attempts to study the holographic heavy quark in \(\mathcal {N} = 4\)  super-Yang-Mills theory [1]}, [2]}, the heavy quark dynamics have been studied in various gauge theories with gravitational duals [11]}, [12]}, [13]}, [14]}, [15]}, [16]}, [17]}, [18]}, [19]}, [20]}, [21]}, [22]}, [23]}, [24]}, [25]}, [26]}, [27]}, [28]}, [29]}, [30]}, [31]}, [32]}, [33]}, [34]}.
